Abstract
In this study, 3D coherent flow structures during incipient particle entrainment under unidirectional flow conditions were experimentally investigated. Time-resolved tomographic particle tracking velocimetry (TOMO-PTV) and the shake the box (STB) algorithm were applied to measure 3D-velocities in a hydraulic laboratory flume. Quadrant and octant analyses were performed, their probabilities of occurrence were determined, and the Q-criterion was used to visualize the dominant 3D-flow structures during particle dislodgement. The results showed that octants related to sweeps and ejections were dominant with a probability of 70%. Fifty ms prior to particle entrainment, only one single contributing octant was observed. At particle entrainment, a sweep, three retrograde vortices, and a prograde vortex paired with a retrograde vortex were identified in the flow field. Considering the whole measurement volume, a group of three hairpin-like structures passed the particle during entrainment. In conclusion, the TOMO-PTV method is well suited and enables novel insights on the interaction between coherent structures and incipient sediment motion.
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Acknowledgments
The authors are grateful for the financial support of the Austrian Federal Ministry for Digital and Economic Affairs. The National Foundation of Research, Technology and Development of Austria is also gratefully acknowledged. Parts of this work have been funded by the EU project SEDDON II (Interreg V-A Austria-Hungary 2014–2020). The authors thank the Equipment BOKU for funding the measurement equipment and Dirk Michealis from La Vision for his support.
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Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 146 • Issue 5 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Nov 9, 2018
Accepted: Sep 10, 2019
Published online: Feb 21, 2020
Published in print: May 1, 2020
Discussion open until: Jul 21, 2020
ASCE Technical Topics:
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Entrainment
- Flow (fluid dynamics)
- Fluid dynamics
- Fluid mechanics
- Hydraulic engineering
- Hydrologic engineering
- Materials engineering
- Methodology (by type)
- Motion (dynamics)
- Particles
- Radiography
- River engineering
- Sediment
- Sediment transport
- Solid mechanics
- Structural analysis
- Structural engineering
- Three-dimensional flow
- Vortices
- Water and water resources
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